package cn.yfxu.server.config.filter;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.util.Collection;

/**
* @author Xxxxyf
* @date 2021/3/8
* @desc 权限控制
 * 根据URL分析请求所需的角色
*/
@Component
public class CustomUrlDecisionManager implements AccessDecisionManager {
    @Override
    public void decide(Authentication authentication, Object object, Collection<ConfigAttribute> collection) throws AccessDeniedException, InsufficientAuthenticationException {
        for (ConfigAttribute configAttribute : collection) {
            //当前URL所需角色
            String needRole = configAttribute.getAttribute();
            //判断角色是否登录即可访问的角色，此角色在customFilter中设置
            if ("ROLE_LOGIN".equals(needRole)){
                if (authentication instanceof AnonymousAuthenticationToken){
                    throw  new AccessDeniedException("尚未登录,请登录!");
                }else{
                    return;
                }
            }
            //判断用户角色是否为URL所需角色
            Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
            for (GrantedAuthority authority : authorities) {
                if (authority.getAuthority().equals(needRole)){
                    return;
                }
            }
        }
        throw  new AccessDeniedException("权限不足，请联系管理员");
    }

    @Override
    public boolean supports(ConfigAttribute configAttribute) {
        return true;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return true;
    }
}
